PIC16LC923-04/L Microchip Technology, PIC16LC923-04/L Datasheet - Page 101
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PIC16LC923-04/L
Manufacturer Part Number
PIC16LC923-04/L
Description
IC MCU OTP 4KX14 LCD DVR 68PLCC
Manufacturer
Microchip Technology
Series
PIC® 16Cr
Datasheet
1.PIC16C923-04L.pdf
(189 pages)
Specifications of PIC16LC923-04/L
Core Processor
PIC
Core Size
8-Bit
Speed
4MHz
Connectivity
I²C, SPI
Peripherals
LCD, POR, PWM, WDT
Number Of I /o
25
Program Memory Size
7KB (4K x 14)
Program Memory Type
OTP
Ram Size
176 x 8
Voltage - Supply (vcc/vdd)
2.5 V ~ 6 V
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Package / Case
68-PLCC
Processor Series
PIC16LC
Core
PIC
Data Bus Width
8 bit
Data Ram Size
176 B
Interface Type
I2C, SPI
Maximum Clock Frequency
8 MHz
Number Of Programmable I/os
25
Number Of Timers
3
Operating Supply Voltage
2.5 V to 6 V
Maximum Operating Temperature
+ 70 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52715-96, 52716-328, 52717-734
Development Tools By Supplier
ICE2000
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PIC16LC923-04/L
Manufacturer:
Microchip Technology
Quantity:
1 964
Company:
Part Number:
PIC16LC923-04/L
Manufacturer:
Microchip Technology
Quantity:
10 000
13.5
There are two methods for LCD voltage generation,
internal charge pump, or external resistor ladder.
13.5.1
The LCD charge pump is shown in Figure 13-13. The
1.0V - 2.3V regulator will establish a stable base volt-
age from the varying battery voltage. This regulator is
adjustable through the range by connecting a variable
external resistor from VLCDADJ to ground. The poten-
tiometer provides contrast adjustment for the LCD. This
base voltage is connected to V
pump. The charge pump boosts V
FIGURE 13-13:CHARGE PUMP AND RESISTOR LADDER
1997 Microchip Technology Inc.
V
DD
VLCDADJ
100k*
130k*
Voltage Generation
CHARGE PUMP
* These values are provided for design guidance only and should be
nominal
10 A
optimized to the application by the designer.
V
V
DD
DD
V
0.47 F*
LCD
LCD
10k*
3
LCD
1 on the charge
1 into V
V
0.47 F*
LCD
LCD
10k*
10k*
2
2 =
Charge Pump
V
0.47 F*
LCD
2*V
is not operating, Vlcd3 will be internally tied to V
the Electrical Specifications section for charge pump
capacitor and potentiometer values.
13.5.2
The LCD module can also use an external resistor lad-
der (R-Ladder) to generate the LCD voltages.
Figure 13-13 shows external connections for static and
1/3 bias. The VGEN (LCDCON<4>) bit must be cleared
to use an external R-Ladder.
1
LCD
10k*
1 and V
EXTERNAL R-LADDER
LCD
3 = 3 * V
0.47 F*
C1
PIC16C9XX
5k*
5k*
LCD
C2
1. When the charge pump
DS30444E - page 101
Connections for
internal charge
pump, VGEN = 1
Connections for
external R-ladder,
1/3 Bias,
VGEN = 0
Connections for
external R-ladder,
Static Bias,
VGEN = 0
SLPEN
LCDEN
DD
. See